64 



M. BEZZI. 



or blackish markings ; venter reddish, the second segment with a yellow band. Third 

 segment of the male with 8-10 long, black cilia at the sides of the hind border ; 

 ovipositor not longer than the last abdominal segment, reddish yellow, with the 

 basal segment depressed. Legs of a prevalent pale reddish colour, but the coxae 

 and the trochanters dark reddish-brown or blackish ; the basal half of the femora 

 and all the praetarsi pale yellowish. Wings (fig. 1) of rather large size, with the veins 

 reddish yellow ; last portion of fourth vein gently bisinuous ; second longitudinal 

 vein long, the distance of its end from that of the first being not much shorter 

 than the distance from that of the third ; small cross- vein long, its lower end 

 placed much after the middle of the discal cell ; lower prolongation of the anal 

 cell longer than the distance of its end from the hind border of the wing. They 

 are hyaline, with a broad, pale yellowish fore border ; which includes the stigma, 

 but excludes the costal cells, and is not extended over the third vein, or only a 

 little ; in contact with this border is a broad and more infuscated patch, surrounding 

 the small cross-vein and encroaching more or less on the upper end of the discal 

 cell. Anal stripe very broad and more infuscated than the marginal one. 



Fig. 1. Tridacus cTemmerezi, Bezzi, sp. n. 



Type c? and type $, and some additional specimens, in the collection of the 

 Imperial Bureau, from Mauritius, Keduit, 1916, collected by Mr. UEmmerez de 

 Charmoy, in whose honour this interesting species is named. 



II. Subgenus Dacus, Bezzi, 1915. 



In my Key to the species (I.e., p. 89) the section 21 (22) must be amplified 

 as follows : — 



21 (22). Face without black spots. 



a (b). Two contiguous hypopleural spots ; third abdominal segment of male 

 ciliated ; wings with a brown anal stripe . . . . immaculatus, Coq. 



b (a). A single hypopleural spot; male with the third abdominal segment not 

 ciliated ; wings without an anal stripe. 



c (d). Frons with three pairs of blackish dots near the eyes ; abdomen entirely 

 black along the middle line ; wings with the submarginal cell hyaline 

 at base over the small cross-vein. . . . . annulatus, Becker. 



d (c). Frons with the basal half brown, the apical half yellowish, and without 

 black dots ; abdomen with a broad, reddish yellow, longitudinal 

 middle band, which is divided by a black line ; wings with the sub- 

 marginal cell broadly infuscated at base and with the upper end of the 

 small cross-vein margined with fuscous . . . . . . mochii, sp. n. 



